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Meeting MS&T22: Materials Science & Technology
Symposium Innovative Process Design and Processing for Advanced Structural Materials
Presentation Title Mechanisms Driving Defect Formation in High Power Laser Welding of Nickel Alloys
Author(s) Mingze Gao, Barnali Mondal, Todd Palmer, Tarasankar Debroy
On-Site Speaker (Planned) Mingze Gao
Abstract Scope High power laser welding produces deep penetrations, which also display unique processing conditions far different from arc welding or low power laser welding and enhance susceptibility to defects. To better understand the mechanisms driving these defects, high power laser welding was conducted on three widely used nickel alloys. Among these alloys, Inconel 690 is most susceptible to keyhole collapse porosity. On the other hand, Inconel 740H displayed higher susceptibility to hot cracking than Inconel 718 while no such defect was found in Inconel 690. Thermodynamic calculations were conducted to investigate the role of alloying elements on solidification path, which also allows for the evaluation of hot cracking susceptibility. A validated heat transfer and fluid flow model for keyhole mode laser welding was employed to capture the spatially variable thermal histories, fluid flow, and solidification conditions. Local variations in these processing conditions were correlated with the occurrence of location dependent defects.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A New Method for Measurement of Flow Stresses at High Strain Rates and Temperatures for Improved Simulation of Friction Stir Welding
A Study on Migrating Boundary Induced Plasticity Using Molecular Dynamics Simulation for Pure Iron
Atomic-scale Unique Interface Observation of η/Al in Al-Zn-Mg Alloy
Co-design of 3D Printing, Parts and Microstructure
Effects of Electric Current on the Plastic Deformation Behavior of Pure Copper, Iron, and Titanium
Electric Current-induced Phenomena in Materials
Enhancement of Mechanical Properties in Nanoporous Gold
Improvement of Mechanical Properties of Metallic Materials by Multilayered Structure
K--8: Effect of Heat Treatment in 9% Ni Steels on Cryogenic Impact Toughness
K-12: Improvement of Structural Stability and Characterization of Nanoscale Defects in Amorphous Alumina Thin Film
K-13: Integrated Welding and Thermal Processing for Ferritic/Martensitic Steels
K-14: MatILDaź - Application of a User-oriented Material Database
K-15: Porous Silicon Carbide (SiC) for Composite Core Sandwich Structures
K-16: Solid-state Bulk Joining of Dissimilar Metal Alloys by Electrically Assisted Pressure Joining
K-17: Study on the Behavior of Fine Particles by the Vibration of the Medium with Polluted Air Inside the Rigid Housing
K-18: The Friction and Product Quality in Dry Metal Forming with Volatile Media
K-2: Automated Process Design for Heat Shrink Casing of Welded Parts of Buried District Heating Pipe
K-4: Development of a Gradient Structural Material Using Electrically Assisted Pressure Joining of Fe-Mn-Al-C Lightweight Steels
K-5: Development of a Self-heated Composite Tool for Out of Autoclave and Out of Oven Cure of Thin Ply Composite Structures
K-6: Development of Highly Stretchable and Impermeable Encapsulation by Applying Wavy-structure to Thermally Grown Silicon Dioxide
K-7: Discontinuous Yielding Behavior Due to Twinning Accompanied by Abnormal Grain Growth in Fine-grained Copper
K-9: Enhanced Flaw-tolerance of Nanoporous Gold with Grain Boundary Plasticity
Manufacture of Advanced 3D Composites Using a New 3D Weaving Technique and Their Design Using a Neural Network
Mechanical Properties and Reliability of Nanolayered Stretchable Interconnect with Nanocrystalline Copper and Ternary Metallic Glass
Mechanisms Driving Defect Formation in High Power Laser Welding of Nickel Alloys
Microstructure-based Fatigue Life Modeling Methodology for Ferritic-pearlitic Hypo-eutectoid Steels
Modern Supercomputing for Accelerating the Design of High-temperature Aluminum Alloys
Monte Carlo Simulations for Microstructure Evolution via Diffusion
Novel Solid-State Metal Powder Fabrication Process for Feedstock of Metal Matrix Composites Additive Manufacturing
On the Micromechanical Response of a Mild Steel during Abrupt Strain Path Changes (SPCs)
Recent Nanoindentation Studies on Innovative Process Design for Advanced Structural Materials
Residual Stress in Steel H-beam Produced by Hot-rolling and QST Investigated by Instrumented Indentation Testing
Structural Evolution during Nanostructuring and Heating of an Additive-manufactured Stainless Steel Examined by X-ray and In-situ Neutron Diffraction Analyses
Uniaxial Tensile Behavior After Baking Treatment in a Low Carbon Steel Accompanying Inhomogeneous Plastic Yielding
Virtual Thermo-mechanical Process Design of Metallic Materials by Integrating Crystal Plasticity and Phase Field Model

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